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fix(scripts): fix image conversion was scrambling palette data (#7367)

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Co-authored-by: Neo Xu <neo.xu1990@gmail.com>
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blkhawk 2024-12-02 03:56:24 +01:00 committed by GitHub
parent 8baabf358b
commit 63ac1cec9b
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1 changed files with 13 additions and 3 deletions
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16
scripts/LVGLImage.py
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@ -872,9 +872,19 @@ class LVGLImage:
def _png_to_indexed(self, cf: ColorFormat, filename: str):
# convert to palette mode
auto_cf = cf is None
reader = png.Reader(
bytes=PngQuant(256 if auto_cf else cf.ncolors).convert(filename))
w, h, rows, _ = reader.read()
# read the image data to get the metadata
reader = png.Reader(filename=filename)
w, h, rows, metadata = reader.read()
# to preserve original palette data only convert the image if needed. For this
# check if image has a palette and the requested palette size equals the existing one
if not 'palette' in metadata or not auto_cf and len(metadata['palette']) != 2 ** cf.bpp:
# reread and convert file
reader = png.Reader(
bytes=PngQuant(256 if auto_cf else cf.ncolors).convert(filename))
w, h, rows, _ = reader.read()
palette = reader.palette(alpha="force") # always return alpha
palette_len = len(palette)